Circuit breaker



FIG. 1 is an isometric view of an embodiment of the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line portion of the figure drawings are included to illustrate portions of the circuit breaker that form no part of the claimed design. 

CLAIM The ornamental design for circuit breaker, as shown and described. 